From Longman Dictionary of Contemporary Englishbe a stealbe a stealCHEAP informal to be very cheap an excellent seafood dish that is a steal at $8.25 → steal
Examples from the Corpus
be a steal• Given the classy surroundings and gracious service, these prices are a steal.• This crisp dry wine is a steal at $9.• This crisp, dry wine is a steal at $ 9. 